Bars are proportional to number of study subjects that have been evaluated across studies with corresponding instrument. Studies that used any form of the Wechsler Intelligence Scale (WAIS, WASI, WISC, WPPSI) were grouped together under “Wechsler.” Studies that used multiple instruments but did not specify how many subjects were administered each instrument were grouped together with all instruments specified.
aDifferential ability scales
bReynolds Intellectual Screening Test